PDF malware analysis — malicious · 89cb2e9315de19ad

MALICIOUS

PDF

53.5 KB Created: 2011-05-26 16:36:39 +03:00 Authoring application: bing.wiki.usfca.edu (via mPDF 5.0)

MD5: 214177de6d67b22d76a975e58317c559 SHA-1: 72c0ee1e94c4806235bcf84aa154b8bdad832c1d SHA-256: 89cb2e9315de19ad645d1f4a50da2fd4d3fbac4d59bf6967fe4aeab66bb23629

68 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The extracted artifact 'javascript_obj0036_000.js' also shows signs of obfuscation. While the exact script functionality is not fully detailed, the presence of obfuscated JavaScript within a malicious PDF strongly suggests it's designed to download and execute a secondary payload or exploit a vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 3

Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js` `10e15f9e8e631690248396d575e9652903435250e89141f7cc58e4b3e9b10d1b`	pdf-javascript-stream	PDF /JS object 36 at offset 0xCCDE	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`stream_003_off00001280.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1280	17756 bytes
`font_01_sfnt_off00004092.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4092	17892 bytes
`font_02_sfnt_off00006ed2.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6ED2	18720 bytes
`font_03_sfnt_off0000a15f.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA15F	18756 bytes

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